Codeplex site: http://orchardblogml.codeplex.com
I have finally released the upgraded version of the BlogML module for all you happy bloggers. This version is intended to work only on Orchard 0.8, but never fear, there is still the 0.5 version of this module kicking around on the Codeplex website so you can export your blog's out in your own time.
The new version has a lot of bug fixes, though I have not been able to solve the problem with time-outs on large files. I have provided support for zip files containing more than one XML file, so you are more than welcome to give that a go instead.
If you need a walk through of the module, please refer to http://www.themayneissue.com/memorystream/blogml-module-for-orchard-0.5-cms-now-available